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... (higher concentration), to inside the cell (lower concentration). Secondly, water passively moves through a membrane channel protein now called an aquaporin , which is why water can cross a membrane more quickly than expected. This is a newer finding, but allow me to elaborate. The plasma membrane ...

... .. the rate of change being an important determinant fits a mathematical model that, unfortunately, does not reveal what is going on .. ADH causes aquaporin 2 proteins to be inserted into the distal nephron (DCT) .. these aquaporins selectively allow water to be resorbed into the body to increase ...